Hydroplane boat



Dec. 9, 1941. w, J, STAMPFL.

HYDROPLANE BOAT 2 Sheets-Sheet l Filed Sept. 13, 1939 I N VEN TOR.

ATTORNEYS.

Dec. 9, 1941. w. J. STA'MPFL HYDROPLANE BOAT Filed Sept 13. 1959 2 Sheets-Sheet 2 2 WTJJZarrzp/Z IN V EN TOR.

ATTORNEYS.

Patented Dec. 9, 1941 3 V madman BOAT Waltcr r. Stampfl. Jamaica, N. r. Application September 13, 1939, serial No. 294,732 r 1 Claim. (on. 11.4-56.5)

The device forming the subject matter of this application is a planing or take ofl step for the boats of hydroplanes.

One'objeot of the invention is to provide means whereby the planing member can be brought "board beingmereiy a convenient designating term, imposing no structuralllmitation. Thwartship reinforcing ribs 8 are secured to the upper flush with the bottom of the hull of the boat. l

A further object of the invention is'to provide novel means for mounting the planing member yieldably. A further object of the inventionis so to mount the planing member that it will yield under landing shocks. Another object of theinvention is to supply planing members catedon opposite sides of the keel line and sustained by offsetting cushioning means, to avoid thwartship oscillation of the hull of the boat.

It is within the province of the disclosure to improve generally and to enhance the utility of devices of that type to which the present invention appertains.

With the above and other objects in view,

which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimedgit being understood that changes in the precise embodiment of the invention herein disclosed,

may be made within the scope of what is claimed,

without departing from 'the'spirit of the invention.

In the accompanying drawings:

Fig. 1 shows, in bottom plan, a hydroplane boat wherein the device forming the subject matter of thisapplication has been embodied, parts being broken away;

Fig. 2 is a cross section on the line,32 of Fig. 1;

;Fig. 3 is a horizontal section on the line 3-3 of Fi .4;

Fig. 4 is a longitudinal section; Fig. 5 is asection on the line [-5 of-Fig. 3; Fig. 6 is a sectional view showing one of the retracting springs and attendant parts.

The numeral I marks the hull of a hydroplane boat. The hull is shown as of the V-type, but that construction is not insisted upon. The bottom members 2 of the hull l are provided with upwardly-projecting box-like, open bottomed oilsets 3, located on opposite sides of the keel line 4 and, if desired, communicating at the keel line,

the offsets being disposed adjacent to the bow 5 of the boat. A stop bar S'is located in the recess formed by the offsets 3 andis secured to the after wall of the offsets.

Fore and aft planing boards I are provided ioning bags M. A pump I6. is located at any.

convenient place on the boat. A conduit 41 leads surfaces of tne'planing boards I, and are located adjacent to the after ends of the planing boards. Fore and aft reinforcing ribs 9 are secured to the upper surfaces of the planing boards I, in transversely spaced relation, the fore and aft ribs 3 extending from the forward ends of the boards, back to places closely adjacent to the thwartship ribs'3. The forward ends of the fore and. aft

ribs 9 are flattened,and are hingedly connected at III, to the hull I, within the oifsets 3. The after. ends of the fore' and aft ribs 3 are flattened, and to the flattened ends of the ribs are connected the lower ends of retractile springs II, the upper ends of the springs being connected to the upper partsot the offsets 3.. The

retractile springs H may be housed within flex-' ible protecting coverings 12, having resiliency.

Cushions, preferably resilient bags 14, are disposed between the planing boards 1 and the upper portions of the oflsets 3. The bags ll may be cemented or secured otherwise to the boards I and to the upper parts of the oflsets 3. Since the fore and aft ribs 9 are engaged with the cushions H, as shown in Fig. 5, the ribs will m in holding the cushions n in place,

A mamioid 15, which may be or the curved form shown in Fig. 2, is mounted at its lower ends on the upper parts of the offsets 3, the manifold being in communication with the cushfrom thepump IS- to the intermediate portion of the manifold 55. The flow of air under pressure, from the pump Hi to the inflatable cushions H is regulated, at the will of an operator, by a valve l8, interposed in the conduit 11, the construction being such that, by proper manipulation of the valve, the flow of air to the cushions H may be stopped, andit being possible, also, to let the air out of the cushions It, by way of the valve it.

The operation of the device will be understood readily. By means of pump pressure transmitted to the cushions H, the planing boards 1 may be swung downwardly to any de- "and, preferably, are madeof metal, theword overcome. When pressure in the cushions H is relieved, the springs II will haul up the after ends of the planing boards 1, until the planing boards are flush with the bottom of the hull.

the recesses of the ofisets 3 accommodating the planing boards and the cushions. Upward movement of the after ends of the planing boards I is stopped by the abutment 6.

' The by-pass I5, transfers the pressure in the cushions [4. If, for example, there happens to be a heavier upward pressure on the port planing board 1 than on the starboard planing board, pressure will be transmitted from the port cushion 'to the starboard cushion, and to the starboard planing board, thwartship oscillation of the boat being prevented.

The device'functions to promote a take-off and to decrease landing shocks.

'Having thusldescribed the invention, what is claimed is:

A hydroplane boat comprising a hullhaving recesses in its-bottom, located on opposite sides of the keel line, planing members shaped to enter the recesses in practically flush relation to the bottom, the planing members having trans-.

versely-spaced, upstanding, fore-and-ait ribs,

means assembled with the hull and with the tor ward portions of the ribs for mounting the planing members for up and down swinging movement, retractile springs connected .to the hull and to the after portions'of the ribs, means operator and interposed in the last-specifiedmeans.

WALTER J. STAMPFL. 

